Check-valve.



BENJAMAN H. CONFERVAND JOHN W. WOODLING, OF ALBION, PENNSYLVANIA.

CHE CK-VALVE lSpeccaton of Letters Patent.

Patented Oct. 1, 1907.y

Application tiled March 6.1905. Serial No. 248,591. A

To all whom it may concern:

Be it known that we, BENJAMAN H. CoNFER and JOHN W. WoonLING, citizensof the United States, residing at Albion, in the county of Erie andState of Pennsylvania, have invented certain new and useful Improvementsin CheckeValves, of which the following is a specification.

Our invention relates to check valves, and more es peciallyto that typeof devices adapted to permit the low of luid or gas under pressure inone direction, while preventing the flow in the opposite direction, thedevice for accomplishing that purpose being associated with acut-ofivalve in the same valve casing. The reason for the introductionofthe cut-off valve is to allow the check valve to be re-seated orrepaired in any Way without disconnecting it, and without blowing ofithe steam from, for example, a boiler to which the check valve permitsthe passage of water. Thus, assuming the check valve to be attached tothe boiler of a locomotive engine and that in the ordinary course itbecomes worn at the seat, or the valve itself is abraded by sand in thewater, in order to fully repair the check valve it is necessary only toclose the cut-ofi valve. The check valve may then be taken apart without,in-

terference with the operation of the boiler in any re-A specialconstruction and arrangement, provided with particularly* formedelements by which the cut-off valve is secured in position with respectto the casing, and protected against accidental displacement from theoutside.

In the accompanying drawings, throughout which like letters refer tolike parts, `Figure l represents a longitudinal vertical section, andFig. 2 is a vertical cross section of our invention on line X-X of Fig.l. Fig. 3 is a top plan of the screw cap of the check valve, and Fig. 4is a top plan of the lscrewcap ofthe cut-off valve.

In the drawings letterAmarks the valve casing common to both the checkvalve and to the cut-off valve. The casing has an inlet fitting B towhich awater service pipe may be joined, and a lateral extension C, atthe end of which is the outlet D that may beI coupled to the boilertting. That portion of the casing A which incloses the check valve isclosed at the top by the screw plug E, that ordinarily possesses apolygonal head in order that it maybe engaged by a wrench, see Fig. 4.Within the casing the check valve seat is designated by letter F, and itwill be observed, is adjustable by reason of its threaded connectionwith the interior of the casing. 4

The check valve is itself marked Gr. It is in form a portion of asphere,and may, therefore, t the seat F in whatever position it may happen todrop upon it. The seat and valve being ground to correspond inthe usualmanner. Valve G is provided with `a irustoconical stem II, and this stemis arranged to enter the socket .l oi the adjustable thimble K, wheneverthe valve lifts. The socket guides the rise and fall of the valve. Hereit will be observed that the thimble K has a threaded engagement with asuitably threaded cavity in the screw plugE, and that it may be byreason of such engagement raised or lowered with respect to the valve G.Thus, the lift of the valve is set at a greater or less amount, and,after the thimble K has been adjusted as desired, it is locked in thatposition by the annular jam nut L. It is believed-to be also clear thatwhatever the lift of the valve, it will always drop back upon its seatin a position to tit it and absolutely prevent any return of fluid whichhas once passed. Furthermore, it is thought to be now apparent from theabove description and from the drawings that all parts of the checkvalve are readily accessible by taking out the screw plug E.

To allow the dismantling of the check valve at all times independent ofthe boiler pressure, we introduce in the extension C of the casing A theplug cut-off M having the port N. The plug M may be turned by itssquared head O, see Fig. l, and it is kept in place by means of the basenut Q, shown in Fig. l as screwed to the lower threaded end P of theplug cut-off M. It is our practice for safety and to prevent theaccumulated dust and dirt from interfering with the operation of cut-ofivalve M to cover the base nut Q with a screw cap R and to similarlyprotecty the head O by the screw cap S. It is not absolutely necessaryto so protect the base and head of the cut-off valve, but it is thepreferred manner of construction and perfectly insures the good workingorder of the cut-ofi valve at all times and under all conditions?. Afurther otlice of cap R is that, as it maybe tightly set up against thecasing extension C as drawn in Fig. l, it locks the plug M either closedas illustrated or in its open position turned half way around from thatshown. The plug may be, therefore, prevented from being accidentallyturned thus closing or opening the passage when not desired.

We are aware that check valves have been constructed associated withcut-ofi valves, and we do not claim that feature. i

Having thus described our invention and explained the mode oi itsoperation, what We claim is- 1. The combination with a valve casing, ofa tapering plug valve, a nut engaging the smaller end of the said valve,the said nut having external threads, and a screw cap engaging theexternal threads of the nut and entirely covering the nut and the end ofsaid valve and arranged to bear against the said casing whereby the saidvalve is held against rotary displacement, substantially as described.

2. The combination with a check-,valve having a casing provided with alateral extension, of a plug cut-off valve situated in the lateralextension of the casing, a removable cap adapted to cover the head ofsaid plug, a nut Q 'engaging the base of said plug, and a screw capengaging the said nut and arranged to be screwed against the casing toprotect and lock the said plug, substantially as described.

3. The combination with a check-valve having a casingr provided with alateral extension, of a plug cut-off valve situated in the lateralextension of the casing, the base nut Q engaging the end of the plug,and a screw cap engaging the base nut and arranged to be screwed against

